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Alt Gr + key combination not working in FF?

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When i wont to type for example "@" i cant because in FF combination of Alt Gr key and V are not working. Why the combination is not working and how i can fix that?

When i wont to type for example "@" i cant because in FF combination of Alt Gr key and V are not working. Why the combination is not working and how i can fix that?

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I had the same problem, in my case the problem was the Firewall (COMODO). I set the Firefox program without permission to access to the keyboard, the most of keys worked perfectly but ALTGR+Any didn't work. Try to allow access to the keyboard to firefox program if you has any firewall with proactive defense.

I hope this solve your problem.

Regards,

Blackmoon